Joint for electrical conduits



l. C. HERRON.

JolN'T FoR EL'EcTRIcAL conmunfs.v APPLICATION FILED MAY I2 l v92v0 .gies are rarely alike.

-tion one with-the other.

JAMES'C. :HERR-0N, OF CHICAGO, ILLINOIS, SSIGNOR lTO REFLECTOR'Ez-iL-UNENTING CO., OFOHGAGO, 113313111015, A. CORPORATION OF EISIJINQS.

JOINT ELECTRICAL 0,0NDUITS.

Application -iled/May 12,

To all whom. t may concern.' Y

Be it yknown that I, JAMES C. HERRON, a citizen of the .United States, and resident of Chicago, county of Cook, and State .ol'lllinois, have invented l'certain new and useful improvements in Joints .for vElectrical Conduits,oi" which the followingis a specification, and which are illustrated in the accompanying'drawings, forming a part thereof.

The invention .relates .to joints for electrical conduits and has as an objectthegprovision ot a device of this character which may be angularly adjusted without danger of wearing the insulation from contained wiring.

Physical embodiments of the invention are illustrated in the .accompanying drawings,in which Fig. lis aside view of a joint showing connected conduits in sectionto expose their interior;

Fig. 2 is a section on line 2-2 of Fig. .1; Fig. 3 is asection on line 3 3 of Fig. 1;

-F-ig. et is aperspective view of one ofthev two like members which, when, assembled, comprise the Aform of the invention shown in Figs. 1. 2'and3;

Fig. 5 is a side view ot a modified `form with a face plate omitted, and

Fig. `6 is a section-on `line----G of Fig. 5 with lthe tace plates in place.

The device provided by the invention is designed to be used with conduits of the nature of that shown in a patent :granted to F A. lVatkins, September 25, 1907, No. 1,240,907, which conduits are especially useful in'lighting show windows. 'In this service it is frequently necessary to carry the conduits around angles and two of the an- .In Ythe absence of .an adjustable angle member it is therefore nec -essary to have a special angle member con- Adiihculty with structed Ifor .each location. adjustable :angle members heretofore proposed has been a danger of wear upon the insulation of contained wiring.

.To provide the form of joint shown in fFig-s. v1, .2 and :3, two members of .the form of Fig. 4 are superposed in reversed posi- The element shown in Fig. .4 compri-ses a portion 10 adapted to telescope within the conduit, a projecting jportion 11 which Ais one-half the thickness of the complete joint and .of theportion 12 thereby leaving the :shoulder 13 which is y'Spallineatisncf Lettersatent.

-flPa'tented Augx, 19223.

1920. SelaLNO. 380,761.

4preferably made concave soas to approxi- .matelyt the periphery of the reversed element comprising the other half of the assembled joint. j

.The side .14` of the element is preferably permanently closed although Va removable plate could be .provided .after `the manner 'shownin Athe .form of Figs. 5 and 6. VTheend ofportion=1`0is .closed where it abuts the shoulder .13, but'is left openiat 15 into the projection .11. At .the center of the side 14 a post 16 is shown which stands withinthe portion 1.1 and extends to theplane of the edge 17 of said portion 11. Thelonly difvference *between vthe A-tw'o elements that are assembled to .make the complete ,joint as shown is that one .post 16 is bored and the .plate 14 is counter sunk to receive the screw .17 while the other ,post vis tapped only, to coact with the .end of the screw and the plate 14 ofthe side may be imperforate.

Conduit v18 of the type with which the form of construction illustrated -in Figs. 1 to t inclusiveis more especially adapted to be used,=commonly has an interior lap joint as shown at `19. To adapt the portion 10 of the joint to telescope with the conduit irrespective oi' theposition of the lap 19the liorrn shown is adopted. This .form cornprises portions 20 .formingportions of the sides ota square sun'iciently smaller than-the ,portion 1.21ct .the joint so that the conduit may slip .thereover :and lits exterior may vcome flush with the exterior ot'ithe portion 12. .As shownythe corners of the portion 10 compriseinstanding.portions 21 and an angle .22 gjoinin'g said 'portions 21, thus Jproviding reentrant angles ateach corner of portion 10. p With .the 1,joint `assembled as shown in Figs. land V2 .the .wires23 and V24 may be run in the conduitandnto .the'joint-.through one opening 15` when each wire will be given .several .turns .about .the posts .'16, yas ,shown at .25, y26, and ithen will extend through the opening 15.013 the other joint element. An electric .fitting to which the lwires .maybe connected is 'indicated Yat'27.

.A .form of the -invention which may be utilized with round foonduits is vshown .in Figs. .5 and 6. .As shown, Athe Vportions "28 Tof 'this form .of .the .invention `are .circular and .maybe .joinedlto the conduit, `not shown, ,in `any r desired manner.

.The circular projecting .portion29 .ofthis .110

tom of the holey 39.

scribed, a coil spring a() is shown which joint is as shown, a rim with a bridge piece v3() spanning'the rim, 'from which bridge piece the post 31 projects. To close the opening of the rim 29 a face plate 32 may be secured in place as by screws entering tapped holes 34 in the bridge piece 30.

For securing the tvvo portions lot the j ointshown in Figs. yand 6 together, there is shown a screw 35 having a shankBGand a. threaded portion 37. Preferably the shank 36 of the screw" is slightly longer than the portion 38 through which it passes so that When the screnT is tightened the head thereof will not `bind upon the bot- Under these circumstances adjustment oi' the angle oi the joint lvvill not be likely to loosen or unduly tighten the screw. krifo prevent rattling,

With the parts formed in the relation deadapted to press the tvvo portions of the joint outwardly.y

The elements .making up this form olf y the joint have an opening at lcorrespondving` to' that at l5 above described and a shoulder at 42 Vwhich closes 'a portion ot the conduit in the manner of' shoulder 135 above referred to. The .Wiring 43, shown in this instance as a duplex cable., may be passed through one opening Lll, may have several turns about thel posts 3l and pass out of the other vopening al."

.The joint provided'by the invention may be adjusted to give an angle between the conduits connected to its ends oit from 180 to zero, or a condition of parallelism.` The form of the device shown in .lhgsz` and e with the center 41:4 offset laterally beyond] the outlines of portions Q8 extended, is capable o'i being adjusted to aposition The only effect upon the iviring, ol" adjustment of the angle ofthe joint, is a slight tightening or loosening oli the turns which acr`tion have no bady effect on the insulation.

Many minor-changes may be made iu the physical embodiment of the invention Without departing `from its spirit.

l claim as my invention n LA; vjoint l:tor conduits comprising, in

combination, .two elements, each 4elementl comprising a portion'` adapted to be connected to a conduit,l a joint member projecting from said portion having a part ci its perimeter formed on the surface cylinder and having opposite flat` sides, the

yeo

axis of Which'cylinder is laterally offset from the center line of said portion, the .thickness of said member' being one-halt .the thickness of said portion and a projecting axially of said member, the Vheight of said post being equal to the thickness of said member the innerends 'ci the posts Iand the innerlflat sides ci ,the cylin drical parts abutting so asl to cause the con-y post the same plane.

duits to be arranged in the same plane, and a screw embedded in one-.post and-extending -into the other post to connect the same.

2. A joint 'for conduits comprising, in

.combinaticn, tivo elements, each element comprising a portion adapted to be connected to a conduit, a joint member projecting Jfrom said `portion having a part of mon axis.`

3. In ak conduit joint, ai pair of substantially similar members eachhaving a substantially cylindrical andr hollow head, a conduit receiving part secured to each head and having a concave shoulder extending outvvardly 1from the inner side tace-of the head,a post interiorly carried by the center of each head, means to secure the posts together with their inner ends abutting, and a conduit connected to each conduit receiving part and arranged 'so that the.

outer sidesozt the tivo conduits and the outer sides ci the two heads respectivelyare in the same planes.

1l. i-i joint for electrical conduits comprising, in` combination, membersl connected together for angular -movement about a r,common axis, each member having av por.

tion adapted to= telescope With a rectangular ,conduit having an internal lap joint near one corner, said portion having a reentrant angle at each corner whereby tl e lap'joint of the Lconduit may have a clearanceinl any position oi the conduit.

ln al conduit joint, a pair of substan tially similar members each having'a yhollo'vv cylindrical head, a conduit receiving vpart having a concave end shoulder carried by each head and connected thereto so that the shoulder extends outwardly beyond the inner side tace of the head to'extend over the vcomplementary head, eachhead having aperforated central rpost therewithin,"the heads andposts having their inner parts engaged With'each other, anda screiv ex- `tending through one of the posts rand'into `the other posts to connect the members, said yheads having their outer side faces formed flat and disposed in the plane of the adja-- cent, portions of the respective conduit receiving partsy and said,y heads being ci equal lits perimeter formed on the surface of a thickness so as to'c'ause the conduits `tolie Janes c.v Hannon'. 

